论文部分内容阅读
采用多通道压力采集系统测量了GeldartB类颗粒(树脂)矩形流化床(2.000m×0.300m×0.025m)内的压力波动,探索了流化床内的压力波动特征;同时采用标准方差、自相关和互相关函数分析了表观气速和静床高度对压力波动、压力波速度和压力波主频的影响。结果表明,气泡行为(如:气泡的形成、发展、聚并和破碎)是影响流化床内压力波动的主要因素;密相和稀相界面处的压力波动幅值主要由气泡崩塌决定;压力波在流化床内进行传播,并且具有明显的周期性特征;此外,压力波动、压力波速度和压力波主频均与表观气速和静床高度密切相关。
The multi-channel pressure acquisition system was used to measure the pressure fluctuation in a GeldartB (resin) rectangular fluidized bed (2.000m × 0.300m × 0.025m) and to explore the characteristics of pressure fluctuation in the fluidized bed. The standard deviation Correlation and cross-correlation function were used to analyze the effects of superficial gas velocity and static bed height on pressure fluctuation, pressure wave velocity and pressure wave frequency. The results show that the bubble behavior (such as bubble formation, development, coalescence and fragmentation) is the main factor affecting the pressure fluctuation in the fluidized bed. The pressure fluctuation amplitude at the dense phase and the dilute phase interface is mainly determined by the bubble collapse. The pressure The waves propagate in the fluidized bed and have obvious periodic characteristics. In addition, the pressure fluctuation, pressure wave velocity and pressure wave frequency are closely related to the superficial gas velocity and the height of the static bed.